First thing which i will do is going for a walk through the city. I'm sure that for foreigner it would be very interesting to visit different special cultural places and find out smth new. Actually, food is very important too. Your friend can try some traditional dishes or drinks. At the end of excursion i will ask my friend to tell me about difference between our country and his homeland. And, of course, we just should do something interesting for both of us. For example I like watching movies, so I can show him some our films or we can just watch smth which is popular in the whole world. For examle, I adore The Simpsons, so it would be very funny to watch them together with some snacks and beer or sweets and a cup of tea. It would also be interesting for me how good he is at sports. So I would probably take him to the gym or playground. Honestly, there are a lot of things which you can do together. But it depends on your certain interests and interests of your friend.